UHF FREQ SEL 28V BLK W/ VOL 071-01576-0101KFS 599B UHF Comm Control Head | 28V, Black, Volume ControlDigital control head for use with KTR-909B and KTR-909A UHF communications transceiver.May be installed alone or in tandem configuration7-segment gas discharge readoutsRemote-mounted switch can be in..